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E, B. SINTZENICH. `STEAM GENERATOR.

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EDWIN B. SINTZENIOH, -OF ROCHESTER, NEW YORK,4 ASSIGNR TO HIM- SELF AND HENRY G. HAMILTON, 0F SAME PLACE.

Letters Patent No.,10bf,222-, dated August 9, 1870.

-Qonq--f- The Schedule referred to in these Letters Patent making part 0f the lame.V M

I, EDWIN B. SINTzE-Nicn, of Rochester, in the county of Monroe and State of New York, have in`- rented certain Improvements in Steam-Generators, of which thefollowing is a specification. A

*My invention relates chiefly to a new arrangement of circulating-tubes in a steam-boiler, and the employment,.in connection therewith, of thimbles, .sccnred to the inner and outer shells, through which the circulatingtubes pass.

In the drawing- Figure 1 is a'vertical central section of an ordinary marine b oilerl'1aving my invention attached.

,"Figure 2 is a front elevation.

The circulating-tubes B B pass centrally through the tire-lines A of the boiler, as fully described in my patent of February 21, 1865, and communicate with the water and steam-spaces at convenient points.

When,howe\'er, the tubes are attached directly to lthe shell of the boiler;v as therein shown, their expansionand contraction, by altern-ate heatingand cool-` in'g, soon loosens the joints 'or cracks the supportingsheets. It is also a matter of diiculty to insert the tubes in a boiler already in use, or to obtain access to them' for cleaning or repairs.

To 'obviatethese diliiculties, I provide, at points opposite the centersof the ilnes A, the thimhles c, ot' annealed tubing, passing through the waterspaces, and secured, similarly to any tlue, to the inner and outer shells ot' thcboler.' The internal diameter of these thimbles is such that the circulating-tubes slip easily through them, and the latter extend through the boiler and project somewhat at each end. Y

Branches a and d are attached to the tubes B BI',

which communicate with theuvater and steam-spacesof the boiler at convenient points, and the length ot these branches allows the expansion ot'lthc tubes without injury tothe connecting joints.

1t will be vobserved that the 4introduction vof the thimbles c is in no way deleterious to the boiler, but, on thecontrary, they act as stays-to 'the shell, while the connections a. 'and d are easy of access for repairs, and the circulatingstubes may be readily cleaned by removing the plugsfronfthcir ends.

In the ordinary form of marine boiler shown inthe i drawing, the lower row of tubes, 1 3', if carried through the'furuace similarly to the others, would interfere with the operationsof the-fireman, and I, therefore,

bend them down inthe rear of the. gratos, and Vconneet them to the water-bottom F; This plan, I find,

by experiment, to be very advantageous, since ordinal-ily the water iu the furnace-bottom is never raised much abovea blood-beat, while, by means oi thebent tubes B', it is pnt into rapid'crcnlation, and this part of the boiler soon becomes ot' the same temperature as theother portions. Y It 'may be desirable to introduce the feed-water through the pipe D and branches D', directly into 'one or more of the circulating-tubes. 'B y this means, snc-h of the tubes as are exposed to the fire are somewhat cooled by the entering water, and thelatter very soon heatedv to the temperature of that within the boiler. Y

- In many cases, however, a deposit of calcareous or saline matter forms at the ends of the branches D', owing to the intense heat, and, for this reason, it is preferable to carry the pipes D' entirely through the' circulating-tubes, andcon'ncct them to the shell of the,boiler, as indicatedby dotted lines f,vfig. 1. The pipes D thus becomea heater for .the water before it enters the boiler. It is more convenient to attach the connections a and d to the outside of the boiler, but in many cases it may be preferable to attach them within, as shown in iig. i, since additional beating-surface is thu-sutilized.

\Vhat I claim as ,my invention isl- 1. The thinbles c, passing through the water-spaces .of a steam-boileuwhen used in connection with the .circulating-tubes B, centrallylocated within the firelues, and connected to the water and steam-spaces of the boiler, substantially as described. f

`..."J.` he`: arrangement of the bent tubes BQwithin the furnace and tireiiues of a steam-boiler, one end being connected to the water-bottom and the otherv to thc water or steam-space ot' the boiler, substantally as and for the purposes set forth.

E. B. SINTZENICH. Witnesses:

F. H. CLEMENT, GEO. T. PARKER. 

